Image output apparatus, control method therefor, image display apparatus, control method therefor, and storage medium

An image display apparatus capable of controlling an amount of light of a backlight, the image display apparatus comprising:

• an acquiring unit configured to acquire information on first image data input to the image display apparatus and second image data input to another image display apparatus;
• a determining unit configured to determine, on the basis of the information acquired by the acquiring unit, whether the first and second image data satisfy a predetermined condition;
• and
• a controlling unit configured to control, when the determining unit determines that the first and second image data satisfy the predetermined condition, the image display apparatus and the other image display apparatus such that either or both of amounts of light and number of light emission control units of backlights used for display of the first and second image data are the same.

A control method for an image display apparatus capable of controlling an amount of light of a backlight, the control method comprising:

• a step of acquiring information on first image data input to the image display apparatus and second image data input to another image display apparatus;
• a step of determining, on the basis of the information acquired in the acquiring step, whether the first and second image data satisfy a predetermined condition;
• and
• a step of controlling, when it is determined in the determining step that the first and second image data satisfy the predetermined condition, the image display apparatus and the other image display apparatus such that either or both of amounts of light and number of light emission control units of backlights used for display of the first and second image data are the same.